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  • 1
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    Numerical aerodynamic simulation facility (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Critical to the advancement of computational aerodynamics capability is the ability to simulate flows about three-dimensional configurations that contain both compressible and viscous effects, including turbulence and flow separation at high Reynolds numbers. Analyses were conducted of two solution techniques for solving the Reynolds averaged Navier-Stokes equations describing the mean motion of a turbulent flow with certain terms involving the transport of turbulent momentum and energy modeled by auxiliary equations. The first solution technique is an implicit approximate factorization finite-difference scheme applied to three-dimensional flows that avoids the restrictive stability conditions when small grid spacing is used. The approximate factorization reduces the solution process to a sequence of three one-dimensional problems with easily inverted matrices. The second technique is a hybrid explicit/implicit finite-difference scheme which is also factored and applied to three-dimensional flows. Both methods are applicable to problems with highly distorted grids and a variety of boundary conditions and turbulence models.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Res. Center Res. in Computerized Structural Analysis and Syn.,; p 15-30
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Mini-mast CSI testbed user's guide (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Mini-Mast testbed is a 20 m generic truss highly representative of future deployable trusses for space applications. It is fully instrumented for system identification and active vibrations control experiments and is used as a ground testbed at NASA-Langley. The facility has actuators and feedback sensors linked via fiber optic cables to the Advanced Real Time Simulation (ARTS) system, where user defined control laws are incorporated into generic controls software. The object of the facility is to conduct comprehensive active vibration control experiments on a dynamically realistic large space structure. A primary goal is to understand the practical effects of simplifying theoretical assumptions. This User's Guide describes the hardware and its primary components, the dynamic characteristics of the test article, the control law implementation process, and the necessary safeguards employed to protect the test article. Suggestions for a strawman controls experiment are also included.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-102630 , NAS 1.15:102630
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Finite-element-analysis model and preliminary ground testing of controls-structures interaction evolutionary model reflector (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Results of two different nonlinear finite element analyses and preliminary test results for the final design of the Controls-Structures Interaction Evolutionary Model are presented. Load-deflection data bases are generalized from analysis and testing of the 16-foot diameter, dish shaped reflector. Natural frequencies and mode shapes are obtained from vibrational analysis. Experimental and analytical results show similar trends; however, future test hardware modifications and finite element model refinement would be necessary to obtain better correlation. The two nonlinear analysis procedures are both adequate techniques for the analysis of prestressed structures with complex geometries.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-4293 , L-17009 , NAS 1.15:4293
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    FLIGHT SAFETY ASPECTS OF MANNED SPACE FLIGHT (1963)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: Flight safety program for mercury manned space vehicle consisting of development engineering and factory rollout inspections, interface control, flight safety reviews, and mission simulation
    Keywords: STRUCTURAL MECHANICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Investigation of lateral acceleration-bending coupling for a large booster utilizing multi accelerometers (1965)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Selection of accelerometer positions to predict system stability of lateral acceleration-bending coupling in large flexible booster
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-74551
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    REVIEW OF LESSONS LEARNED IN THE MERCURY PROGRAM RELATIVE TO SPACECRAFT DESIGN AND OPERATIONS (1963)
    In:  Other Sources
    Details
    Publication Date: 2019-05-11
    Description: Spacecraft design and operations as learned from mercury project
    Keywords: STRUCTURAL MECHANICS
    Type: AIAA PAPER 63073
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Manned Spacecraft Center Viewpoints on Reliability and Quality Control (1962)
    In:  CASI
    Details
    Publication Date: 2019-05-21
    Description: Reliability and quality control requirements for manned space flight - designs, procedures, and schedules
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-X-51030
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Langley's CSI evolutionary model: Phase O (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A testbed for the development of Controls Structures Interaction (CSI) technology to improve space science platform pointing is described. The evolutionary nature of the testbed will permit the study of global line-of-sight pointing in phases 0 and 1, whereas, multipayload pointing systems will be studied beginning with phase 2. The design, capabilities, and typical dynamic behavior of the phase 0 version of the CSI evolutionary model (CEM) is documented for investigator both internal and external to NASA. The model description includes line-of-sight pointing measurement, testbed structure, actuators, sensors, and real time computers, as well as finite element and state space models of major components.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-104165 , NAS 1.15:104165
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Vibration and local instability of thermally stressed plates (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The vibration and buckling of a double wedge square cantilever plate has been investigated. It is shown that the free vibration modes, which occur at Delta T ref = 0, transition into the buckled modes which occur at Delta T ref = Delta T ref-cr for the respective mode. Delta T ref-cr for a particular mode is defined as the magnitude of thermal load at which the frequency of the particular mode vanishes. The analysis yields the same number of buckling eigenvalues and buckling modes as there are vibration eigenvalues and vibration modes. Gradual application of the load in the analysis permits the change in each vibration frequency of interest and its associated mode to be followed up to the load at which the frequency of the mode becomes zero. This constitutes the limit of linear theory. As the load is increased, the thin edges of the plate begin to deform during vibration. This local deformation, which begins in the vibration mode, is shown to transition into the phenomena of local edge buckling at Delta T ref-cr for the mode.
    Keywords: STRUCTURAL MECHANICS
    Type: Computer Methods in Applied Mechanics and Engineering; 25; Mar. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Vibration of skewed cantilever plates and helicoidal shells (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Theoretical vibration frequencies and mode shapes are obtained for skewed plates and helicoidal shells with a cantilever boundary. Using Hamilton's law of varying action, a power series solution is developed to obtain converged numerical results for the five lowest frequencies. Effects of geometrical variables such as aspect ratio, sweep angle and shell radius to thickness ratio are investigated. Accuracy of the solution method is substantiated by comparison with existing skewed plate spherical cap, and conical shell results.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-2588
    Format: application/pdf
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